Toy model for plasmonic metamaterial resonances coupled to two-level system gain
Optics
2008-11-15 v2
Abstract
We propose, solve, and discuss a simple model for a metamaterial incorporating optical gain: A single bosonic resonance is coupled to a fermionic (inverted) two-level-system resonance via local-field interactions. For given steady-state inversion, this model can be solved analytically, revealing a rich variety of (Fano) absorption/gain lineshapes. We also give an analytic expression for the fixed inversion resulting from gain pinning under steady-state conditions. Furthermore, the dynamic response of the 'lasing SPASER', i.e., its relaxation oscillations, can be obtained by simple numerical calculations within the same model. As a result, this toy model can be viewed as the near-field-optical counterpart of the usual LASER rate equations.
Keywords
Cite
@article{arxiv.0809.0487,
title = {Toy model for plasmonic metamaterial resonances coupled to two-level system gain},
author = {Martin Wegener and Juan Luis Garcia-Pomar and Costas M. Soukoulis and Nina Meinzer and Matthias Ruther and Stefan Linden},
journal= {arXiv preprint arXiv:0809.0487},
year = {2008}
}